package cgl.narada.transport.rtp;
/**
 * Software License, Version 1.0
 *
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 *
 *Redistribution and use in source and binary forms, with or without
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For
 * further information contact the Community Grids Lab at
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and
 * wherever such third-party acknowledgments normally appear.
 *
 *4) The name Indiana University or Community Grids Lab or GlobalMMCS,
 * shall not be used to endorse or promote products derived from this software
 * without prior written permission from Indiana University.  For written
 * permission, please contact the Advanced Research and Technology Institute
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called GlobalMMCS,
 * nor may Indiana University or Community Grids Lab or GlobalMMCS appear
 * in their name, without prior written permission of ARTI.
 *
 * Indiana University provides no reassurances that the source code provided
 * does not infringe the patent or any other intellectual property rights of
 * any other entity.  Indiana University disclaims any liability to any
 * recipient for claims brought by any other entity based on infringement of
 * intellectual property rights or otherwise.
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS.
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS",
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION
 *GENERATED USING SOFTWARE.
 */


import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
import java.util.StringTokenizer;

import cgl.narada.matching.rtp.RtpEvent;
import cgl.narada.transport.TransportDebugFlags;
import cgl.narada.transport.TransportHandler;

/**
    The receiver end of the UDP communications. Listens for datagram packets
    arriving at a socket and performs various operations based on situations
    arising during communications. These received packets are then encapsulated
    into a specialized data structure and forwarded to the transport handler
    implenetation residing in the transport layer.

 * @author Ahmet Uyar
 * @version 1.0
*/
public class RTPReceiverThread extends Thread implements TransportDebugFlags {

   public final static int MAX_PACKET_SIZE = 65507;
   private DatagramSocket socket;
   private int port;
   private byte[] buffer = new byte[16000];
   private int messageTracker = 0;
   private String moduleName = "RTPReceiverThread: ";
   private RTPLinkFactory rtpLinkFactory;
   private TransportHandler transportHandler;
   private int rtpTopic;
   private int nodeIdentifier = 0;
   private boolean stopped = false;

   public RTPReceiverThread(int rtpTopic, DatagramSocket socket, RTPLinkFactory rtpLinkFactory) {
      System.out.println(moduleName + "Topic subscribed to ==> " + rtpTopic);
      this.socket = socket;
      this.rtpTopic = rtpTopic;
      this.rtpLinkFactory = rtpLinkFactory;
      transportHandler = rtpLinkFactory.getTransportHandler();

      byte[] buffer = new byte[MAX_PACKET_SIZE];
   }

   public void setNodeIdentifier(int nodeId) {

      if (nodeIdentifier == 0) {
         nodeIdentifier = nodeId;
         return;
      }

      System.out.println(moduleName + "Error: Setting node identifier again?");
   }

   public void run() {
      DatagramPacket dp = new DatagramPacket(buffer, buffer.length);

      if (RTPReceiverThread_Debug) {
         System.out.println(moduleName + "waiting for Datagram packets on port " + socket.getLocalPort() + "...");
      }

      StringTokenizer token;
      int dataInfo;
      int dataLength;
      int port;
      String address;

      try {
         while ( !stopped ) {
            socket.receive(dp);

            byte[] data = dp.getData();
            port = dp.getPort();
            dataLength = dp.getLength();

            //System.out.print("[ r" + messageTracker+++",l"+ dataLength + "]\n");
            String hostInfo = dp.getAddress().getHostName();
            int portInfo = dp.getPort();
            String sender = "rtp://" + hostInfo + ":" + port;

            if (RTPReceiverThread_Debug) {
               /**System.out.println(moduleName + "Received [" + new String(data, 1, dataLength-1) +
                  "] from (" + hostInfo + ":" + portInfo  + ")");*/
            }

            /** The data received now has to be encapsulated into an event and
                subsequently propagated to the protocol layer via the dataReceived
                method in the transportHandler. */
            RtpEvent rtpEvent = new RtpEvent(nodeIdentifier, rtpTopic, data, 0, dataLength);
            transportHandler.dataReceived(rtpEvent.getBytesWithClientFlag(), sender);
            dp.setLength(buffer.length);
         }/* end while(true) */
      } catch (SocketException se) {
         se.printStackTrace();
      } catch (java.io.IOException ioe) {
         ioe.printStackTrace();
      }/* end try-catch*/
   }/* end (run) */

   public void close(){
      stopped = true;
      socket.close();
   }
}